#include<iostream>
#include<string>
#include<unistd.h>
#include<pthread.h>


int tickets=1000;
pthread_mutex_t mutex= PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond=PTHREAD_COND_INITIALIZER;

void *start_routine(void *args)
{   
    std::string name=static_cast<const char*>(args);
    while(true)
    {

        pthread_mutex_lock(&mutex);
        pthread_cond_wait(&cond,&mutex);//为什么要有mutex
        //判断暂时省略
        std::cout<<name<<"->"<<tickets<<std::endl;
        tickets--;
        pthread_mutex_unlock(&mutex);
    }
}
int main()
{
    //通过条件变量控制线程的执行
    pthread_t t1,t2;
    pthread_create(&t1,nullptr,start_routine,(void*)"thread 1");
    pthread_create(&t2,nullptr,start_routine,(void*)"thread 2");
    while(true)
    {
        sleep(1);
        pthread_cond_signal(&cond);//唤醒一个线程
        std::cout<<"main thread wakeup one thread..."<<std::endl;;
    }


    pthread_join(t1,nullptr);
    pthread_join(t2,nullptr);
}